# XWUIChartContour

A contour chart variant backed by `XWUIChart` that reads a gridded field of values and draws iso-level bands, the cartographic way to show where a surface rises and falls across two axes. Supply one named `series` per grid row, each holding its cells as `{ x, y }` points (column label and level), then pick a `block` (1-4) and `size` preset.

## Basic Usage

Five named rows, each with seven randomized cell values, forming a 5x7 field that is contoured.

```example
file: examples/BasicUsage.ts
html: examples/BasicUsage.html
title: Basic Usage
description: A 5x7 grid of randomized values rendered as a contour chart at the md preset.
```

## Terrain Elevation Field

A topographic-style elevation grid in metres, built from a tall central peak and a lower ridge so the iso-level bands read like contour lines on a map.

```example
file: examples/TerrainElevation.ts
html: examples/TerrainElevation.html
title: Terrain Elevation Field
description: A 16x12 elevation field in metres with a peak and a ridge, contoured as height bands.
```

## WiFi Signal Coverage

A floor-plan field of WiFi signal strength in dBm using logarithmic path loss, where the contour bands mark coverage zones from strong near the router to far-corner dead spots.

```example
file: examples/WifiSignal.ts
html: examples/WifiSignal.html
title: WiFi Signal Coverage
description: An 18x12 signal-strength field in dBm radiating from a router across a floor plan.
```

```api
```